Modular forms

Diamond operator

In number theory, the diamond operators 〈d〉 are operators acting on the space of modular forms for the group Γ1(N), given by the action of a matrix (a bc δ) in Γ0(N) where δ ≈ d mod N. The diamond operators form an abelian group and commute with the Hecke operators. (Wikipedia).

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Related pages

Modular form | Hecke operator | Abelian group | Number theory | Group (mathematics)